Top 550+ Solved Mass Transfer MCQ Questions Answer
Q. Under conditions of flooding in packed tower, the gas pressure drop
a. Decreases rapidly
b. Increases rapidly
c. Remain constant
d. Is maximum
Q. With increase in solvent rate, the number of transfer units, NtoG, for a fixed degree of absorption from a fixed amount of gas
a. Increases
b. Decreases
c. Decreases linearly
d. Remain unaffected
Q. Absorption accompanied with chemical reaction is exemplified by the absorption of
a. Ammonia in water
b. Benzol present in coke oven gas by wash oil
c. SO2 in alkaline solution
d. All (A), (B) and (C)
Q. For turbulent mass transfer in pipes, the Sherwood number depends on the Reynoldsnumber as
a. Re0.33
b. Re0.53
c. Re0.83
d. Re
Q. In a counter-current liquid extractor
a. Both liquids flow at fixed rate
b. Both liquids can have any desired flow rate
c. Only one of the liquids may be pumped at any desired rate
d. Liquid’s flow rate depends upon the temperature and pressure
Q. The vapour pressure exerted by the moisture contained in a wet solid depends upon the
a. Nature of the moisture
b. Temperature
c. Nature of the solid
d. All (A), (B) and (C)
Q. In distillation, overhead product contains
a. Only one component
b. Two components
c. Any number of components
d. Only saturated liquid
Q. Equilibrium-moisture curves of different solids
a. Are different
b. Are same
c. Depend on the humidity of the gas
d. None of these
Q. The caking of crystals can be prevented by
a. Maintaining high critical humidity
b. Maintaining low critical humidity
c. Coating the product with inert material
d. Both (A) and (C)
Q. In McCabe-Thiele method of theoretical plate calculation for a distillation column, the operating lines of stripping and rectifying sections coincide with the diagonal at __________ reflux.
a. Total
b. Minimum
c. Operating
d. Maximum permissible
Q. Steady state equimolal counter diffusion occurs in case of
a. Leaching
b. Absorption
c. Binary phase distillation
d. Liquid-liquid extraction
Q. On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in
a. Greater degree of separation with a fixed number of trays
b. Increased reboiler load
c. Increased reflux ratio
d. None of these
Q. __________ is used as an 'entrainer' for the separation of acetic acid-water mixture by distillation.
a. Furfural
b. Benzol
c. Butyl acetate
d. Hexane
Q. Mass transfer rate between two fluid phases does not necessarily depend on the __________ of the two phases.
a. Chemical properties
b. Physical properties
c. Degree of turbulence
d. Interfacial area